cogenhoekid

Hi All, I wonder if anyone can help please? my 1999 650 Dragstar has done 1800 miles, (yes I know), it will start ok, but usually won't run cleanly, intermitently it spits back thru the carbs, then wont tickover, I've checked all the usual stuff plugs cleaned carbs air cleaner but to no avail. It seems like a fuel problem with the poor running but then it goes and backfires!!! I'm at a bit of a loss. Thanks in advance.